The effects of water temperature on the resting and post-exercise physiology in juvenile Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus)
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Date
2019
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University of New Brunswick
Abstract
The effects of cold-water temperature on the resting and post-exercise physiology were investigated in juvenile Atlantic sturgeon. Hematocrit, protein, glucose, osmolality, and lactate were measured after four weeks of acclimation, at rest (at 3 °C, 6 °C, or 9 °C), or following five minutes of exercise (at 3 °C or 9 °C). At 3 °C, fish appeared motionless and were positioned at the bottom of the tank. At 9 °C, fish were visibly more active. Resting glucose, protein, lactate, and hematocrit levels were similar across temperatures, and resting osmolality values were lowest at 9 °C. Post-exercise lactate and glucose levels were similar at 3 and 9 °C. Post-exercise osmolality and hematocrit values increased at 9 °C only, and levels of protein decreased at both temperatures. Overall, sturgeon can survive at cold temperatures, but don’t show the typical physiological response to this type of exercise (i.e., increased glucose, lactate and osmolality).